C11112331312111112111133133313331333132313233313231323223311211   >>    C1111233131211111211113313331333133313231323331323132322331121   <<    C11112331312111112111133133313331333132313233313231323223311213   >>      C11112331312111112111133133313331333132313233313231323223311212   >>